import { Speedcore } from '../speedcore';
import { BMSChart } from '../bms/chart';
import { SpeedSegment } from '../speedcore/segment';
/**
 * A Positioning represents the relation between song beats and
 * display position, and provides a way to convert between them.
 *
 * In some rhythm games, the amount of scrolling per beat may be different.
 * StepMania’s `#SCROLL` segments is an example.
 */
export declare class Positioning {
    _speedcore: Speedcore;
    /**
     * Constructs a Positioning from the given `segments`.
     * @param segments
     */
    constructor(segments: PositioningSegment[]);
    /**
     * Returns the scrolling speed at specified beat.
     * @param beat the beat number
     */
    speed(beat: number): number;
    /**
     * Returns the total elapsed scrolling amount at specified beat.
     * @param beat the beat number
     */
    position(beat: number): number;
    /**
     * Creates a {Positioning} object from the {BMSChart}.
     * @param {BMSChart} chart A {BMSChart} to construct a {Positioning} from
     */
    static fromBMSChart(chart: BMSChart): Positioning;
}
export interface PositioningSegment extends SpeedSegment {
    /** the beat number */
    t: number;
    /** the total elapsed amount of scrolling at beat `t` */
    x: number;
    /** the amount of scrolling per beat */
    dx: number;
    /** whether or not to include the
     starting beat `t` as part of the segment */
    inclusive: boolean;
}
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